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DATA SHEET
OfficeConnect Switches and Hubs
Key Benefits Easy to Install and UseEnjoy plug-and-play
simplicity.
Simple Troubleshooting
Get at-a-glance network status infor-mation from front-panel
diagnosticLEDs, including a unique Alert LED.
Compact Design
Save valuable small-office space withcompact, ergonomic, and
clippabledesign.
Lifetime Limited Warranty
Ensures peace of mind when purchas-ing OfficeConnect products;
includespower adapters.
Free Telephone Support
3Com offers telephone assistance dur-ing the first 90 days,
including instal-lation and general troubleshooting.
Engineered for Small-Business Needs
The OfficeConnect family is the firstsolution designed
specifically forsmall-office operationsoften imi-tated but never
equaled by other network vendors.
Specifically designed for small busi-nesses and offices, 3Com
OfficeConnect
switches and hubs provide businesseswith an integrated system of
small-office networking. By installing aLAN, users can work more
effectivelywith file and print sharing and reducecosts by sharing
expensive resourcesas printers.
OfficeConnect products provide con-nectivity for every business
need. Forthe value-conscious user, standardEthernet hubs are ideal,
while FastEthernet switches and hubs provideadditional speed for
high-volume
traffic. OfficeConnect Dual SpeedEthernet switches and hubs
featureautosensing technology, allowingusers to migrate to higher
speedswhen needed. They are available in avariety of port
densitiesfrom 4 to16 ports.
OfficeConnect switches and hubs are acore part of the
OfficeConnect family,providing small businesses with thepower to
share information, set uppowerful, comprehensive servers,connect
remote offices, and access the Internet.
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Ethernet technology
Using twisted-pair cables, you canconnect a maximum of four
Ethernet(10 Mbps) hubs in series betweenworkstations, or between a
workstationand a nonrepeater piece of equipment(such as a switch).
Each cable mustnot exceed 100 m (328 ft).
Since its inception, Ethernet has becomethe most popular
topology in LANs.Based on the IEEE 802.3 standard,Ethernet has
evolved over the yearsand now supports a range of mediaand
significant enhancements thatthe original standard never did. The10
Mbps available bandwidth can beeither shared across a number of
usersusing hubs or dedicated to worksta-tions using switched
technology.
Technology Explained
OFF ICECONNECT SWITCHES AND HUBS
OfficeConnect Family
The 3Com OfficeConnect family offersthe most flexible,
expandable, andintegrated networking solutions forsmall
businesses.
OfficeConnect products include:
LAN connectivity
Network interface cards
Switches and hubs
Networking kits
HP JetDirect print servers
Remote access and Internet connectivity
LAN modems
Cable modems
Internet firewalls
Network server family
Network storage servers
3Com Internet server
Switch or Hub?
With a hub, all users share the samebandwidth. This works well
with a fewusers and low traffic requirements, butas you add users
or implement morebandwidth-hungry software applica-tions,
competition for bandwidth canstart to slow down traffic on the
LAN.
Switches are more appropriate whenyou need greater network
performanceof a high-speed server uplink, such aswhen connecting
users to a few hubsor servers, or when connecting manypower users.
A switch improves perfor-mance and shortens network responsetimes
by reducing the number ofusers per segment. A switch does thatby
providing dedicated bandwidth toevery deviceserver, PC, or
hubconnected to one of its ports.
2
Example:
10 Mbps link
Dual Speed
Hub 8
10 Mbps
hub
Switch
Workstatio
n
Workstatio
n
10 Mbps
hub
10 Mbps
hub
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Fast Ethernet
Fast Ethernet is based on the Ethernetstandard yet runs at 10
times the speed(100 Mbps). It is now one of the mostpopular
high-speed technologies becauseof its cost effectiveness,
stability, andcompatibility with existing EthernetLAN environments.
Fast Ethernetswitching allows dedicated performancebetween two
devices.
The total length of cable (A+B+Cbelow) between two
workstationsand a nonrepeater piece of equipment(such as a switch)
must not exceed205 m (672 ft). Each cable (A, B, or C)must not
exceed 100 m (328 ft).
3Com recommends using Category 5cables and that the cable (B)
betweenthe Fast Ethernet hub is not longerthan 5 m (16.4 ft). This
allows themaximum hub-to-workstation cablelength (A or C) of 100 m
(328 ft) to beused, as shown.
OFF ICECONNECT SWITCHES AND HUBS
Example:
100 Mbps link
A
B
C Dual Speed
Hub 8Hub
Switch
100 Mbps
hub
Hub
Workstatio
n
Workstatio
n
5 m(16.4 ft)
100 m(328 ft)
100 m(328 ft)
Workstatio
n
Workstatio
n
These rules do notapply to FastEthernet switches.You can
connectas manyOfficeConnectswitches togetheras your
businessrequires.
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OFF ICECONNECT SWITCHES AND HUBS
OfficeConnect Dual SpeedSwitches
OfficeConnect Dual Speed Switchesare designed for small
businesses thatwant high network performance toexchange larger data
files and images,and access real-time information.
OfficeConnect Dual Speed Switchesallow dedicated, high-speed
connec-tions at either 10BASE-T or 100BASE-TX, making them ideal
for connectingservers or multiple hubs in smallbusinesses or
offices and providing aflexible migration path. They
provideexpandable connections for 5, 8, or16 users or networked
devices.
OfficeConnect Dual Speed Switch 16
10/100 Buffer Autonegotia- LED Priority MAC MDI/MDIX Forwarding
Telephone FCC Class B Externalautosensing memory ting full- and
indicators queuing addresses method support and powerports
half-duplex supported lifetime supply
ports limitedwarranty
OfficeConnect Dual Speed Switch 5 5 1 M All 5 Alert, Power,
1,024 Auto Store & 11 W(3C16790) Duplex, Port ForwardA low port
density, high-performance, status (activity, Fast Ethernet switch
ideal for boosting connectionnetwork performance with multiple hub
speed)aggregation or server connection.
OfficeConnect Dual Speed Switch 8 8 1 M All 8 Alert, Power,
1,024 Auto Store & 11 W(3C16791) Duplex, Port ForwardA popular
switch ideal for connecting status (activity, servers, multiple
hubs, or desktops for connectionsmall businesses that use
bandwidth- speed)intensive applications.
OfficeConnect Dual Speed Switch 16 16 2 M All 16 Alert, Power,
2,048 Manual Store & 14.4 W(3C16735B) Activity, ForwardProvides
high-performance switching Duplex,for bandwidth-intensive
applications. Speed
OfficeConnect Dual Speed Hubs
OfficeConnect Dual Speed Hubs
The OfficeConnect family of dualspeed hubs provides full 100
Mbpsperformance and is designed for smallbusinesses that want more
performancefrom their network. This family ofhubs delivers quick
exchange of databetween PCs and swift downloadingfrom the network.
OfficeConnectDual Speed Hubs feature 10/100autosensing technology
and provide
the flexibility to connect devices ateither speedautomatically
assigningpower where possible and offering asmooth transition from
10 Mbps to100 Mbps.
Each hub features plug-and-playinstallation, requires no
configuration,has an easy-to-read, front-panel dis-play with
diagnostic LEDs. All hubsare backed by 3Coms lifetime
limitedwarranty and 90-day telephone support.
OfficeConnect Dual Speed Hub 16
OfficeConnect Dual Speed Hub 8 8 Alert, Power, 1,024 14.4
W(3C16750B) Network A popular hub combining Fast Ethernet
utilization, performance with the flexibility to expand Port
status, an existing Ethernet network to Fast Ethernet.
Collision
OfficeConnect Dual Speed Hub 16 16 Alert, Power, 1,024 14.4
W(3C16751B) Network Ideal for Fast Ethernet connectivity with
utilization, the flexibility to expand an existing Ethernet Port
status, network to Fast Ethernet. Collision
10/100 autosensing ports
LED indicators MAC addressessupported
MDI/MDIX port
Telephone support and lifetime limited warranty
FCC Class B External power supply
4
OfficeConnect Dual Speed Switches
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OFF ICECONNECT SWITCHES AND HUBS
5
OfficeConnect Ethernet Hubs
OfficeConnect Ethernet Hubs
The OfficeConnect family of Ethernethubs is specifically
designed for smallbusinesses with basic networkingrequirements,
such as file or periph-eral sharing, or for those who simply
want to add additional users to a10BASE-T network.
OfficeConnecthubs offer compatibility with legacycoax networks and
provide connectionsfor 4, 8, or 16 users or
networkeddevices.OfficeConnect Ethernet Hub 8
OfficeConnect Ethernet Hub 4 (3C16704A) 4 11 WA low-cost,
entry-level hub, providing basic Ethernet connectivity.
OfficeConnect Ethernet Hub 4C (3C16703A) 4 1 1 11 WIdeal for
entry-level networks requiring alternative media connectivity.
OfficeConnect Ethernet Hub 8 (3C16700A) 8 11 WA popular
entry-level hub providing basic Ethernet connectivity.
OfficeConnect Ethernet Hub 8C (3C16701A) 8 1 11 WIdeal hub for
businesses wanting to expand their existing coaxial network.
OfficeConnect Ethernet Hub 16C (3C16702A) 16 1 11 WProvides
expanded network capacity and connectivity to legacy coaxial
networks.
10BASE-T RJ-45
10BASE-Tcoax
10BASE-T AUI LED indicators Network utilization(LED)
MDI-MDIXport
Telephonesupport andlifetime lim-ited warranty
FCC Class B Externalpower supply
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OFF ICECONNECT SWITCHES AND HUBS
OfficeConnect Switches and Hubs Features 10/100 autosensing
ports Allows users to connect at either 10 Mbps or 100 Mbps to the
switch or hub. The
switch or hub will operate at the highest speed possible,
optimizing network per-formance and user flexibility.
Alert LED A unique LED present on all OfficeConnect switches and
hubs provides additionaldiagnostic information.
Auto MDI/MDIX This feature, available on new OfficeConnect Dual
Speed Switch 5 (3C16790) andSwitch 8 (3C16791), eliminates most
common cabling problems (see MDI/MDIXpush button switch).
Compact and clippable design New, one-piece clipping system lets
users connect up to four units in a stack.
External power supply Provides more flexibility and reduces
power requirements in the product, eliminatingthe need for a noisy
fan.
FCC Class B Indicates that a product is certified for use in
domestic as well as office environments(more stringent
classification than Class A).
Fully compatible with leading OfficeConnect units support Novell
NetWare, Microsoft Windows 95, 98, 2000, operating systems Windows
NT, and other leading software systems, giving the widest range of
back-
ward compatibility with existing office software.
Full duplex (switches only) Automatically doubles the throughput
(to 20 Mbps or 200 Mbps) when ports areconnected to other
full-duplex devices or ports.
Lifetime limited warranty and Provides complete piece of
mind.telephone support
MDI/MDIX push button switch Enables direct connection to a
server, end station, or another switch or hub, usingregular
straight-through cables.
Network utilization meter Indicates how much of the network
bandwidth is in use. These LEDs are continually (available on most
updated to show when the network needs more bandwidth.OfficeConnect
hubs)
Priority queuing Ensures that real-time applications (such as
audio or video) take priority so they can (OfficeConnect Dual Speed
run effectively, even during bursts of high traffic load.Switches 5
and 8)
6
OfficeConnect LED Indicators
As this front view of theOfficeConnect Fast Ethernet Hub8
illustrates, each OfficeConnectunit offers a variety of
LEDindicators, including an AlertLED to allow quick monitoringof
hub and network activity.The Alert LED gives usersimmediate
notification ofproblems, such as excessivenetwork use, without
requiringspecial technical knowledge.
Alert LED(Orange)Alerts you toexcessivenetwork useor an
isolated(partitioned)10BASE-T and100BASE-TXport.
Power LED(Green) Indicatesthat the powersupply to theunit is
present.
Port Status LEDs(Green/Yellow) Indicate the statusof each port.
If green, there is alink present at 100 Mbps. Ifyellow, there is a
link present at10 Mbps. If the LED is off,nothing is connected.
Flashingof an LED indicates activityover that link.
Duplex Indicator(Orange) If the LED isorange, the link isrunning
at full duplex.If the LED is off butthere is a link on thatport,
that link isrunning at half duplex.
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OFF ICECONNECT SWITCHES AND HUBS
Specifications OfficeConnect HubsOfficeConnect hubs come with a
user guide, poweradapter, one-piece clipping system, and rubber
feet.
OfficeConnect Ethernet Hub 4 (10BASE-T Hub)3C16704A
Connectors:4 RJ-45 ports for 10BASE-T twisted pair
Dimensions: Width: 228 mm (9.1 in)Height: 41.8 mm (1.6 in)Depth:
135.4 mm (5.3 in)Weight: 500 g (1.1 lb)
Power: 11 VAFunctional: ISO 8802/3; IEEE 802.3; EMC; EN 55022
Class B;EN 55024; EN 61000-3-2, EN 61000-3-3; FCC Part15 Class B;
ICES-003 Class B; VCCI Class B; AS/NZS3548 Class B
Environmental: EN 60068 (IEC 68)Safety: UL 1950; EN 60950; CSA
22.2 #950, IEC 950
OfficeConnect Ethernet Hub 4C (10BASE-T Hub)3C16703A
Connectors: 4 RJ-45 ports for 10BASE-T twisted pair; one BNCport
for 10BASE2 thin Ethernet (50 ohm); one AUI
Dimensions: Width: 228 mm (9.1 in)Height: 41.8 mm (1.6 in)
Depth: 135.4 mm (5.3 in)Weight: 500 g (1.1 lb)
Power: 11 VAFunctional: ISO 8802/3; IEEE 802.3; EMC; EN 55022
Class B;EN 55024; EN 61000-3-2, EN 61000-3-3; FCC Part15 Class B;
ICES-003 Class B; VCCI Class B; AS/NZS3548 Class B
Environmental: EN 60068 (IEC 68)Safety: UL 1950; EN 60950; CSA
22.2 #950, IEC 950
OfficeConnect Ethernet Hub 8 (10BASE-T Hub)3C16700A
Connectors: 8 RJ-45 ports for 10BASE-T twisted pair
Dimensions: Width: 228 mm (9.1 in)Height: 41.8 mm (1.6 in)Depth:
135.4 mm (5.3 in)Weight: 500 g (1.1 lb)
Power: 11 VAFunctional: ISO 8802/3; IEEE 802.3; EMC; EN 55022
Class B;EN 55024; EN 61000-3-2, EN 61000-3-3; FCC Part15 Class B;
ICES-003 Class B; VCCI Class B; AS/NZS3548 Class B
Environmental: EN 60068 (IEC 68)Safety: UL 1950; EN 60950; CSA
22.2 #950, IEC 950
OfficeConnect Ethernet Hub 8C (10BASE-T Hub)3C16701A
Connectors: 8 RJ-45 ports for 10BASE-T twisted pair; one BNCport
for 10BASE2 thin Ethernet (50 ohm)
Dimensions: Width: 228 mm (9.1 in)Height: 41.8 mm (1.6 in)Depth:
135.4 mm (5.3 in) + 15.2 mm (0.6 in) forcoaxial portWeight: 550 g
(1.2 lb)
Power: 11 VAFunctional: ISO 8802/3; IEEE 802.3; EMC; EN 55022
Class B;EN 55024; EN 61000-3-2, EN 61000-3-3; FCC Part15 Class B;
ICES-003 Class B; VCCI Class B; AS/NZS3548 Class B
Environmental: EN 60068 (IEC 68)Safety: UL 1950; EN 60950; CSA
22.2 #950, IEC 950
OfficeConnect Ethernet Hub 16C (10BASE-T hub)3C16702A
Connectors: 16 RJ-45 ports for 10BASE-T twisted pair; oneBNC
port for 10BASE2 thin Ethernet (50 ohm)
Dimensions: Width: 228 mm (9.1 in) Height: 60.6 mm (2.4 in)
Depth: 185.4 mm (7.3 in)Weight: 960 g (2.1 lb)
Power: 11 VAFunctional: ISO 8802/3; IEEE 802.3; EMC; EN 55022
Class B;EN 55024; EN 61000-3-2, EN 61000-3-3; FCC Part15 Class B;
ICES-003 Class B; VCCI Class B; AS/NZS3548 Class B
Environmental: EN 60068 (IEC 68)Safety: UL 1950; EN 60950; CSA
22.2 #950, IEC 950
OfficeConnect Dual Speed Hub 8 (10BASE-T/100BASE-TX Hub)
3C16750B
Connectors: 8 RJ-45 10BASE-T/100BASE-TX ports
Dimensions: Width: 228 mm (9.1 in)Height: 60.6 mm (2.4 in)Depth:
185.4 mm (7.3 in)Weight: 960 g (2.1 lb)
Power: 33 VAFunctional: ISO 8802/3; IEEE 802.3; EMC; EN 55022
Class B;EN 55024; EN 61000-3-2, EN 61000-3-3; FCC Part15 Class B;
ICES-003 Class B; VCCI Class B; AS/NZS3548 Class B
Environmental: EN 60068 (IEC 68)Safety: UL 1950; EN 60950; CSA
22.2 #950, IEC 950
7
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OFF ICECONNECT SWITCHES AND HUBS
Specifications (continued)
Ordering Information
OfficeConnect Dual Speed Hub 16 (10BASE-T/100BASE-TX Hub)
3C16751B
Connectors: 16 RJ-45 10BASE-T/100BASE-TX ports
Dimensions: Width: 228 mm (9.1 in)Height: 60.6 mm (2.4 in)
Depth: 185.4 mm (7.3 in) Weight: 1000 g (2.2 lb)
Power: 53 VAFunctional: ISO 8802/3; IEEE 802.3; EMC; EN 55022
Class B;EN 55024; EN 61000-3-2, EN 61000-3-3, FCC Part15 Class B;
ICES-003 Class B; VCCI Class B; AS/NZS3548 Class B
Environmental: EN 60068 (IEC 68)Safety: UL 1950; EN 60950; CSA
22.2 #950, IEC 950
OfficeConnect SwitchesOfficeConnect switches come with a user
guide,power adapter, one-piece clipping system, andrubber feet.
OfficeConnect Dual Speed Switch 5 (10BASE-T/100BASE-TX Hub)
3C16790
Connectors: 5 RJ-45 10BASE-T/100BASE-TX ports
Dimensions: Width: 228 mm (9.1 in)Height: 41.8 mm (1.6 in)Depth:
135.4 mm (5.3 in)Weight: 600 g (1.3 lb)
Power: 11 VAFunctional: ISO 8802/3; IEEE 802.3; EMC; EN 55022
Class B;EN 55024; EN 61000-3-2, EN 61000-3-3, FCC Part15 Class B;
ICES-003 Class B; VCCI Class B; AS/NZS3548 Class B
Environmental: EN 60068 (IEC 68)Safety: UL 1950; EN 60950; CSA
22.2 #950, IEC950
OfficeConnect Dual Speed Switch 8 (10BASE-T/100BASE-TX Hub)
3C16791
Connectors: 8 RJ-45 10BASE-T/100BASE-TX ports
Dimensions: Width: 228 mm (9.1 in)Height: 41.8 mm (1.6 in)Depth:
135.4 mm (5.3 in)Weight: 600 g (1.3 lb)
Power: 11 VAFunctional: ISO 8802/3; IEEE 802.3; EMC; EN 55022
Class B;EN 55024; EN 61000-3-2, EN 61000-3-3, FCC Part15 Class B;
ICES-003 Class B; VCCI Class B; AS/NZS3548 Class B
Environmental: EN 60068 (IEC 68)Safety: UL 1950; EN 60950; CSA
22.2 #950, IEC 950
OfficeConnect Dual Speed Switch 16 (10BASE-T/100BASE-TX Hub)
3C16735B
Connectors: 8 RJ-45 10BASE-T/100BASE-TX ports
Dimensions: Width: 228 mm (9.1 in)Height: 60.6 mm (2.4 in)
Depth: 185.4 mm (7.3 in)Weight: 1,000 g (2.2 lb)
Power: 13.2 VAFunctional: ISO 8802/3; IEEE 802.3; EMC; EN 55022
Class B;EN 55024; EN 61000-3-2, EN 61000-3-3, FCC Part15 Class B;
ICES-003Class B; VCCI Class B; AS/NZS3548 Class B
Environmental: EN 60068 (IEC 68)Safety: UL 1950; EN 60950; CSA
22.2 #950, IEC 950
3Com Corporation, Corporate Headquarters, 5400 Bayfront Plaza,
P.O. Box 58145, Santa Clara, CA 95052-8145
To learn more about 3Com solutions, visit www.3com.com. 3Com
Corporation is publicly traded on Nasdaq under the sym-bol
COMS.
Copyright 2001 3Com Corporation. All rights reserved. 3Com and
OfficeConnect are registered trademarks of 3ComCorporation. The
3Com logo is a trademark of 3Com Corporation. Windows and Windows
NT are trademarks ofMicrosoft. NetWare is a trademark of Novell.
All other company and product names may be trademarks of their
respec-tive companies. All specifications are subject to change
without notice.
Printed in the U.S.A. 400317-012 04/01
OfficeConnect Dual Speed Switch 5 3C16790
OfficeConnect Dual Speed Switch 8 3C16791
OfficeConnect Dual Speed Switch 16 3C16735B
OfficeConnect Dual Speed Hub 8 3C16750B
OfficeConnect Dual Speed Hub 16 3C16751B
OfficeConnect Ethernet Hub 4 3C16704A
OfficeConnect Ethernet Hub 4C 3C16703A
OfficeConnect Ethernet Hub 8 3C16700A
OfficeConnect Ethernet Hub 8C 3C16701A
OfficeConnect Ethernet Hub 16C 3C16702A